[U-Boot] README: remove wrong config name

[Tom Rini]

On Wed, Nov 06, 2013 at 05:24:02PM +0200, Igor Grinberg wrote:

> There is no CONFIG_PCA953X_INFO symbol.
> U-Boot uses CONFIG_CMD_PCA953X_INFO instead, which is described in
> "Monitor Functions" section and thus no need to be repeated in the
> "GPIO Support" section.
> Remove the whole line.
> 
> Signed-off-by: Igor Grinberg <grinberg at compulab.co.il>

Applied to u-boot/master, thanks!

-- 
Tom
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